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WO2001055572A2 - Method for control of an internal combustion engine with variable valve control - Google Patents

Method for control of an internal combustion engine with variable valve control Download PDF

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Publication number
WO2001055572A2
WO2001055572A2 PCT/DE2001/000203 DE0100203W WO0155572A2 WO 2001055572 A2 WO2001055572 A2 WO 2001055572A2 DE 0100203 W DE0100203 W DE 0100203W WO 0155572 A2 WO0155572 A2 WO 0155572A2
Authority
WO
WIPO (PCT)
Prior art keywords
internal combustion
combustion engine
switching operation
valve control
change
Prior art date
Application number
PCT/DE2001/000203
Other languages
German (de)
French (fr)
Other versions
WO2001055572A3 (en
Inventor
Dietmar Schwarzenthal
Armin Hassdenteufel
Original Assignee
Dr. Ing H.C.F. Porsche Aktiengesellschaft
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr. Ing H.C.F. Porsche Aktiengesellschaft, Robert Bosch Gmbh filed Critical Dr. Ing H.C.F. Porsche Aktiengesellschaft
Priority to US09/937,699 priority Critical patent/US6634985B2/en
Priority to JP2001555679A priority patent/JP4469533B2/en
Priority to EP01913513A priority patent/EP1165952B1/en
Priority to DE50105750T priority patent/DE50105750D1/en
Publication of WO2001055572A2 publication Critical patent/WO2001055572A2/en
Publication of WO2001055572A3 publication Critical patent/WO2001055572A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0203—Variable control of intake and exhaust valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • F02D41/023—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission in relation with the gear ratio shifting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/02—Clutches
    • B60W2510/0208—Clutch engagement state, e.g. engaged or disengaged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • F02D41/022—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission in relation with the clutch status
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for controlling an internal combustion engine, the internal combustion engine being equipped with a device for changing a valve control.
  • changing the valve control means that variables of the valve control such as, for example, valve lift or phase position can be set by means known per se.
  • the valve control changes depending on various operating parameters of the internal combustion engine.
  • Such an operating parameter can be the current load of the internal combustion engine, for example.
  • One way of detecting such a load is to query the position of a throttle valve of the internal combustion engine.
  • a change in the load of the internal combustion engine leads to a change in the valve control if a load threshold value defined for switching between the stages is exceeded. If the load of the internal combustion engine changes frequently in the range of the load threshold value, then there are frequent switching operations in the valve control, and thus increased wear and possibly unsatisfactory operating behavior of the internal combustion engine.
  • the invention is based on the finding that changes in the load of Internal combustion engine take place in particular when there is a switching process in a transmission downstream of the internal combustion engine. It is therefore proposed to monitor a transmission connected downstream of the internal combustion engine to determine whether a shifting process takes place in the transmission. If such a switching process is recognized, a change in the valve control is suppressed.
  • This method advantageously significantly reduces the number of changes in the valve control and thus improves the wear behavior of the valve control and, if appropriate, the operating behavior of the internal combustion engine, since it is now prevented that the performance characteristics of the internal combustion engine are additionally influenced by a change in the valve control when the transmission is shifted ,
  • a shift process can be recognized by a control unit of the automatic transmission emitting a signal when this control unit triggers a shift process. Such a signal can then be generated and forwarded particularly simply if the control unit of the automatic transmission is connected to a control unit for valve control via a data bus, for example a CAN bus.
  • a gearshift process can be recognized completely independently of the type of transmission, in that a wheel speed signal is compared with an engine speed signal. If this ratio changes, there is a switching operation or the power flow between the internal combustion engine and the wheels of the motor vehicle is different interrupted. This method can be implemented very easily, since wheel speed signals are already detected as a vehicle speed signal or for an anti-lock braking system in all vehicles.
  • FIG. 1 shows a sketch of a drive train of a motor vehicle with a
  • FIG. 2 shows a section of the sketch according to FIG. 1, but for an automatic transmission
  • FIG. 3 shows a flowchart of a method according to the invention for controlling an internal combustion engine
  • FIG. 4 shows a method for recognizing a switching operation for the method according to FIG
  • FIG. 3 and FIG. 5 show an alternative method for recognizing a switching operation for the method according to FIG. 3.
  • the drive train for a motor vehicle shown in FIG. 1 consists of an internal combustion engine 1, a manual transmission 2 connected downstream of the internal combustion engine 1, a propeller shaft 3 for connecting the transmission 2 to a differential 4 and two cardan shafts 5 which connect the differential 4 to the driven wheels 6 , The other two wheels 7 are not driven.
  • a controller 8 receives as operating variables of the internal combustion engine 1, a signal DK for the throttle valve position and thus the first for the load of the internal combustion engine also available to the control unit 8 of the internal combustion engine 1, a signal n m ot for the speed of the internal combustion engine.
  • control unit 8 receives a signal of a driving speed v of the motor vehicle from a signal generator 9 and the signal k of a clutch switch 10, which monitors the position of a clutch pedal 11.
  • the clutch pedal 11 actuates a clutch 12 arranged in the transmission 2.
  • the arrangement of the signal generator 9 on the differential 4 has the effect that the signal v for the driving speed is determined as the mean value of the wheel speeds of the driven wheels 6.
  • FIG. 2 shows a section of the sketch according to FIG. 1 of a drive train with an automatic transmission 13.
  • automatic transmission means that the power flow in the transmission 13 is not interrupted by the driver and a clutch pedal 11, but by a control unit 14 of the automatic transmission 13.
  • the further design of the automatic transmission 13 is irrelevant.
  • FIG. 3 shows a (sub) program running in control unit 8 in a flow chart.
  • the transmission 2 or the automatic transmission 13 is monitored to determine whether a shifting process takes place in the transmission. If such a switching process is recognized, the program is continued with the next step 21.
  • step 21 the change in the signal uv is further suppressed in a step 22 for an additional time period tz.
  • This time period tz is dimensioned in such a way that changes in the signal DK and thus the load of the internal combustion engine 1, which occur in connection with the shifting process in the transmission 2, 13 that has just ended
  • step 10 stand, come to rest in this period tz. If this time period tz has expired, or if no switching operation was recognized in step 20, the program is ended and the control unit 8 transfers to other program parts, not shown here.
  • FIG. 4 shows a first possibility of recognizing a switching operation in step 20. 15 To do this, it is checked whether the signal k assumes the value 1. If this is the case, the process branches to step 21. Otherwise the program according to FIG. 3 is ended. The signal k assumes the value 1 in the following cases:
  • FIG. 5 shows an alternative method for recognizing a switching operation in step 25 20.
  • a ratio i (t) of the signals n mo t and v is formed.
  • a deviation di of the current ratio i (t) is calculated with a previously determined ratio i (t-1).
  • the current ratio i (t) is stored as the previous ratio i (t-1).
  • a step 27 checked whether the amount of the deviation di is above a maximum value d ma ⁇ . If this is the case, then a switching process is recognized and a branch is made to step 21. Otherwise the program according to FIG. 3 ends.
  • the maximum value dmax for the amount of the deviation di indicates a permissible deviation which does not yet indicate a switching process or another process that additionally influences the load of the internal combustion engine 1.
  • the maximum value d ma ⁇ can assume a value of essentially zero in a manual transmission 2.
  • a change in the ratio i (t) can also be caused outside of a switching operation. This can be the case, for example, if the automatic transmission 13 is provided on the input side with a hydraulic torque converter.
  • the choice of the size of the maximum value d ma ⁇ can determine whether, for example, a slip should occur in the torque converter mentioned in order to suppress the change in the valve control.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Transmission Device (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention relates to a method for control of an internal combustion engine, whereby the internal combustion engine is equipped with a means of variable valve control. The aim of the invention is to only permit a change in valve control, when necessary for the operation of the internal combustion engine. Said aim is achieved, whereby a gearbox, arranged in series with the engine, is monitored for a gear change process. When such a gear change process is occurring, the change in valve control is inhibited.

Description

Verfahren zur Steuerung einer Brennkraftmaschine mit variabler Ventilsteuerung Method for controlling an internal combustion engine with variable valve control
Die Erfindung betrifft ein Verfahren zur Steuerung einer Brennkraftmaschine, wobei die Brennkraftmaschine mit einer Vorrichtung zur Änderung einer Ventilsteuerung ausgestattet ist. Änderung der Ventilsteuerung bedeutet in diesem Zusammenhang, daß Größen der Ventilsteuerung wie beispielsweise Ventilhub oder Phasenlage durch an sich bekannte Mittel einstellbar sind.The invention relates to a method for controlling an internal combustion engine, the internal combustion engine being equipped with a device for changing a valve control. In this context, changing the valve control means that variables of the valve control such as, for example, valve lift or phase position can be set by means known per se.
Bei derartigen Vorrichtungen findet eine Änderung der Ventilsteuerung abhängig von verschiedenen Betriebsparametern der Brennkraftmaschine statt. Ein solcher Betriebsparameter kann beispielsweise die aktuelle Last der Brennkraftmaschine sein. Eine Möglichkeit zur Erfassung einer solchen Last ist die Abfrage der Stellung einer Drosselklappe der Brennkraftmaschine. Insbesondere bei Vorrichtungen zur Änderung der Ventilsteuerung, bei denen die Ventilsteuerung nicht stufenlos, sondern in Stufen verstellt wird, führt eine Änderung der Last der Brennkraftmaschine zu einer Änderung in der Ventilsteuerung, wenn ein für die Umschaltung zwischen den Stufen festgelegter Last-Schwellwert überschritten wird. Ändert sich die Last der Brennkraftmaschine häufig im Bereich des Last-Schwellwertes, so kommt es zu häufigen Schaltvorgängen in der Ventilsteuerung, und somit zu einem erhöhten Verschleiß und unter Umständen auch zu einem unbefriedigenden Betriebsverhalten der Brennkraftmaschine.In devices of this type, the valve control changes depending on various operating parameters of the internal combustion engine. Such an operating parameter can be the current load of the internal combustion engine, for example. One way of detecting such a load is to query the position of a throttle valve of the internal combustion engine. Particularly in the case of devices for changing the valve control, in which the valve control is not adjusted continuously but in stages, a change in the load of the internal combustion engine leads to a change in the valve control if a load threshold value defined for switching between the stages is exceeded. If the load of the internal combustion engine changes frequently in the range of the load threshold value, then there are frequent switching operations in the valve control, and thus increased wear and possibly unsatisfactory operating behavior of the internal combustion engine.
Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, ein Verfahren zur Steuerung einer Brennkraftmaschine mit variabler Ventilsteuerung zu schaffen, bei dem eine Änderung der Ventilsteuerung nur dann stattfindet, wenn diese für den Betrieb der Brennkraftmaschine erforderlich ist.Starting from this prior art, it is an object of the invention to provide a method for controlling an internal combustion engine with variable valve control, in which a change in the valve control only takes place when it is necessary for the operation of the internal combustion engine.
Erfindungsgemäß wird diese Aufgabe mit den Merkmalen des Patentanspruches 1 gelöst. Der Erfindung liegt dabei die Erkenntnis zugrunde, daß Wechsel in der Last der Brennkraftmaschine insbesondere dann stattfinden, wenn es in einem der Brennkraftmaschine nachgeschalteten Getriebe zu einem Schaltvorgang kommt. Es wird daher vorgeschlagen, ein der Brennkraftmaschine nachgeschaltetes Getriebe dahingehend zu überwachen, ob im Getriebe ein Schaltvorgang stattfindet. Wird ein solcher Schaltvorgang erkannt, so wird eine Änderung der Ventilsteuerung unterdrückt. Mit diesem Verfahren wird vorteilhafterweise die Anzahl der Änderungen der Ventilsteuerung deutlich reduziert und somit das Verschleißverhalten der Ventilsteuerung sowie gegebenenfalls das Betriebsverhalten der Brennkraftmaschine verbessert, da nun verhindert ist, daß bei einem Schaltvorgang des Getriebes zusätzlich die Leistungscharakteristik der Brennkraftmaschine durch eine Änderung der Ventilsteuerung beeinflußt wird.According to the invention, this object is achieved with the features of claim 1. The invention is based on the finding that changes in the load of Internal combustion engine take place in particular when there is a switching process in a transmission downstream of the internal combustion engine. It is therefore proposed to monitor a transmission connected downstream of the internal combustion engine to determine whether a shifting process takes place in the transmission. If such a switching process is recognized, a change in the valve control is suppressed. This method advantageously significantly reduces the number of changes in the valve control and thus improves the wear behavior of the valve control and, if appropriate, the operating behavior of the internal combustion engine, since it is now prevented that the performance characteristics of the internal combustion engine are additionally influenced by a change in the valve control when the transmission is shifted ,
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.Advantageous developments of the invention are described in the subclaims.
So wird zum Erkennen eines Schaltvorganges bei einem Schaltgetriebe vorgeschlagen, eine Kupplung zu überwachen und bei geöffneter Kupplung auf einen Schaltvorgang zu schließen. Eine solche Überwachung kann beispielsweise in sehr einfacher Weise durch Abfragen eines Kupplungsschalters am Kupplungspedal erfolgen. Gerade bei einem Schaltgetriebe ist der Wechsel in der Last der Brennkraftmaschine besonders hoch, da hier für einen Schaltvorgang die Last der Brennkraftmaschine auf Null reduziert wird. Bei einem Automatgetriebe kann ein Schaltvorgang erkannt werden, indem ein Steuergerät des Automatgetriebes ein Signal abgibt, wenn dieses Steuergerät einen Schaltvorgang auslöst. Ein solches Signal kann dann besonders einfach erzeugt und weitergeleitet werden, wenn das Steuergerät des Automatgetriebes mit einem Steuergerät für die Ventilsteuerung über einen Datenbus, beispielsweise einen CAN-Bus, verbunden ist.In order to identify a shift process in a manual transmission, it is proposed to monitor a clutch and to conclude a shift process when the clutch is open. Such monitoring can be carried out, for example, in a very simple manner by querying a clutch switch on the clutch pedal. In the case of a manual transmission in particular, the change in the load of the internal combustion engine is particularly high since the load on the internal combustion engine is reduced to zero for a switching operation. In an automatic transmission, a shift process can be recognized by a control unit of the automatic transmission emitting a signal when this control unit triggers a shift process. Such a signal can then be generated and forwarded particularly simply if the control unit of the automatic transmission is connected to a control unit for valve control via a data bus, for example a CAN bus.
Völlig unabhängig von der Bauart des Getriebes kann ein Schaltvorgang erkannt werden, indem ein Raddrehzahlsignal mit einem Motordrehzahlsignal ins Verhältnis gesetzt wird. Ändert sich dieses Verhältnis, so liegt ein Schaltvorgang vor, oder der Kraftfluß zwischen der Brennkraftmaschine und den Rädern des Kraftfahrzeuges ist auf andere Weise unterbrochen. Dieses Verfahren kann sehr einfach umgesetzt werden, da Raddrehzahlsignale bereits als Fahrgeschwindigkeitssignal oder für ein Antiblockier-Bremssystem in allen Fahrzeugen bereits erfaßt werden.A gearshift process can be recognized completely independently of the type of transmission, in that a wheel speed signal is compared with an engine speed signal. If this ratio changes, there is a switching operation or the power flow between the internal combustion engine and the wheels of the motor vehicle is different interrupted. This method can be implemented very easily, since wheel speed signals are already detected as a vehicle speed signal or for an anti-lock braking system in all vehicles.
Schließlich kann es vorgesehen sein, nach einem erkannten Schaltvorgang eine Änderung der Ventilsteuerung für einen sich unmittelbar anschließenden, vorgegebenen Zeitraum (d.h. eine Totzeit) zu unterdrücken, um auf diese Weise zu verhindern, daß eine Lastanpassung nach einem Schaltvorgang zu einer Änderung der Ventilsteuerung führt.Finally, it can be provided, after a detected switching operation, to suppress a change in the valve control for an immediately subsequent predetermined period (i.e. a dead time), in order to prevent a load adjustment after a switching operation from leading to a change in the valve control.
Der Erfindung ist nachstehend anhand des in den Figuren dargestellten Ausführungsbeispieles näher beschrieben. Es zeigen: Figur 1 eine Skizze eines Antriebsstranges eines Kraftfahrzeuges mit einemThe invention is described below with reference to the embodiment shown in the figures. FIG. 1 shows a sketch of a drive train of a motor vehicle with a
Schaltgetriebe Figur 2 einen Ausschnitt der Skizze nach Figur 1, jedoch für ein Automatgetriebe, Figur 3 ein Flußdiagramm eines erfindungsgemäßen Verfahrens zur Steuerung einer Brennkraftmaschine, Figur 4. ein Verfahren zum Erkennen eines Schaltvorganges für das Verfahren nach2 shows a section of the sketch according to FIG. 1, but for an automatic transmission, FIG. 3 shows a flowchart of a method according to the invention for controlling an internal combustion engine, and FIG. 4 shows a method for recognizing a switching operation for the method according to FIG
Figur 3 und Figur 5 ein alternatives Verfahren zum Erkennen eines Schaltvorganges für das Verfahren nach Figur 3.3 and FIG. 5 show an alternative method for recognizing a switching operation for the method according to FIG. 3.
Der in Figur 1 dargestellte Antriebsstrang für ein Kraftfahrzeug besteht aus einer Brennkraftmaschine 1, einem der Brennkraftmaschine 1 nachgeschalteten Schaltgetriebe 2 , einer Kardanwelle 3 zur Verbindung des Getriebes 2 mit einem Differential 4 sowie zwei Gelenkwellen 5, die das Differential 4 mit den angetriebenen Rädern 6 verbinden. Die beiden anderen Räder 7 sind nicht angetrieben. Ein Steuergerät 8 erhält als Betriebsgrößen von der Brennkraftmaschine 1 ein Signal DK für die Drosselklappenstellung und damit für die Last der Brennkraftmaschine 1. Zusätzlich erhält das Steuergerät 8 von der Brennkraftmaschine 1 ein Signal nmot für die Drehzahl der Brennkraftmaschine 1. Die Brennkraftmaschine 1 ist mit einer variablen Ventilsteuerung ausgestattet, wie sie beispielsweise aus der DE 40 06 910 AI (= US 5,120,278) näher bekannt ist. Das Steuergerät 8 steuert diese Vorrichtung zur Änderung der Ventilsteuerung über ein Signal uv in der Weise an, daß bei einem Wert des Signals uv = 0 eine erste Phasenlage in der Ventilsteuerung und bei einem Signal uv = 1 eine zweite Phasenlage in der Ventilsteuerung eingestellt wird.The drive train for a motor vehicle shown in FIG. 1 consists of an internal combustion engine 1, a manual transmission 2 connected downstream of the internal combustion engine 1, a propeller shaft 3 for connecting the transmission 2 to a differential 4 and two cardan shafts 5 which connect the differential 4 to the driven wheels 6 , The other two wheels 7 are not driven. A controller 8 receives as operating variables of the internal combustion engine 1, a signal DK for the throttle valve position and thus the first for the load of the internal combustion engine also available to the control unit 8 of the internal combustion engine 1, a signal n m ot for the speed of the internal combustion engine. 1 The internal combustion engine 1 is equipped with a variable valve control, as is known, for example, from DE 40 06 910 AI (= US 5,120,278). The control unit 8 controls this device to change the valve control via a signal uv in such a way that a first phase position in the valve control is set for a value of the signal uv = 0 and a second phase position in the valve control for a signal uv = 1.
Schließlich erhält das Steuergerät 8 ein Signal einer Fahrgeschwindigkeit v des Kraftfahrzeuges von einem Signalgeber 9 sowie das Signal k eines Kupplungsschalters 10, der die Stellung eines Kupplungspedales 11 überwacht. Das Kupplungspedal 11 betätigt dabei eine im Getriebe 2 angeordnete Kupplung 12.Finally, the control unit 8 receives a signal of a driving speed v of the motor vehicle from a signal generator 9 and the signal k of a clutch switch 10, which monitors the position of a clutch pedal 11. The clutch pedal 11 actuates a clutch 12 arranged in the transmission 2.
Die Anordnung des Signalgebers 9 am Differential 4 bewirkt, daß das Signal v für die Fahrgeschwindigkeit als Mittelwert der Raddrehzahlen der angetriebenen Räder 6 bestimmt wird.The arrangement of the signal generator 9 on the differential 4 has the effect that the signal v for the driving speed is determined as the mean value of the wheel speeds of the driven wheels 6.
Figur 2 zeigt in einem Ausschnitt der Skizze nach Figur 1 einen Antriebsstrang mit einem Automatgetriebe 13. Automatgetriebe bedeutet in diesem Zusammenhang, daß der Kraftfluß im Getriebe 13 nicht durch den Fahrer und ein Kupplungspedal 11, sondern über ein Steuergerät 14 des Automatgetriebes 13 unterbrochen wird. Die weitere Bauart des Automatgetriebes 13 ist ohne Bedeutung.FIG. 2 shows a section of the sketch according to FIG. 1 of a drive train with an automatic transmission 13. In this context, automatic transmission means that the power flow in the transmission 13 is not interrupted by the driver and a clutch pedal 11, but by a control unit 14 of the automatic transmission 13. The further design of the automatic transmission 13 is irrelevant.
Die Signalverbindungen zwischen dem Steuergerät 8 und der Brennkraftmaschine 1 sind gegenüber Figur 1 unverändert. An die Stelle des Signales k vom Kupplungsschalter 10 tritt hier ein Signal k für einen Schaltvorgang, das über einen CNN-Datenbus zwischen dem Steuergerät 8 und der Steuerung 14 des Automatgetriebes 13 ausgetauscht wird. Der weitere Antriebsstrang ist gegenüber der Figur 1 unverändert. Figur 3 zeigt in einem Flußdiagramm ein im Steuergerät 8 ablaufendes (Unter-) Programm. In einem ersten Schritt 20 wird das Getriebe 2 bzw. das Automatgetriebe 13 dahingehend überwacht, ob im Getriebe ein Schaltvorgang stattfindet. Wird ein solcher Schaltvorgang erkannt, so wird das Programm mit dem nächsten Schritt 21 fortgesetzt,The signal connections between the control unit 8 and the internal combustion engine 1 are unchanged compared to FIG. 1. The signal k from the clutch switch 10 is replaced by a signal k for a switching operation, which is exchanged between the control unit 8 and the controller 14 of the automatic transmission 13 via a CNN data bus. The further drive train is unchanged from FIG. 1. FIG. 3 shows a (sub) program running in control unit 8 in a flow chart. In a first step 20, the transmission 2 or the automatic transmission 13 is monitored to determine whether a shifting process takes place in the transmission. If such a switching process is recognized, the program is continued with the next step 21.
5 indem für die Dauer des Schaltvorganges eine Änderung des Signals uv unterdrückt wird. Unmittelbar anschließend an Schritt 21 wird in einem Schritt 22 die Änderung des Signals uv für einen zusätzlichen Zeitraum tz weiter unterdrückt. Dieser Zeitraum tz ist hierbei so bemessen, daß Änderungen des Signals DK und damit der Last der Brennkraftmaschine 1, die im Zusammenhang mit dem soeben beendeten Schaltvorgang im Getriebe 2, 135 by suppressing a change in the signal uv for the duration of the switching operation. Immediately after step 21, the change in the signal uv is further suppressed in a step 22 for an additional time period tz. This time period tz is dimensioned in such a way that changes in the signal DK and thus the load of the internal combustion engine 1, which occur in connection with the shifting process in the transmission 2, 13 that has just ended
10 stehen, in diesem Zeitraum tz zu liegen kommen. Ist dieser Zeitraum tz abgelaufen, oder wurde in Schritt 20 kein Schaltvorgang erkannt, so ist das Programm beendet, und das Steuergerät 8 geht zu anderen, hier nicht dargestellten Programmteilen über.10 stand, come to rest in this period tz. If this time period tz has expired, or if no switching operation was recognized in step 20, the program is ended and the control unit 8 transfers to other program parts, not shown here.
Figur 4 zeigt eine erste Möglichkeit zum Erkennen eines Schaltvorganges in Schritt 20. 15 Hierzu wird geprüft, ob das Signal k den Wert 1 annimmt. Ist dies der Fall, so wird zu Schritt 21 verzweigt. Anderenfalls wird das Programm nach Figur 3 beendet. Das Signal k nimmt in folgenden Fällen den Wert 1 an:FIG. 4 shows a first possibility of recognizing a switching operation in step 20. 15 To do this, it is checked whether the signal k assumes the value 1. If this is the case, the process branches to step 21. Otherwise the program according to FIG. 3 is ended. The signal k assumes the value 1 in the following cases:
- Im Falle des Schaltgetriebes 2 nach Figur 1, wenn das Kupplungspedal 11 aus seiner Ruhelage herausbewegt und somit eine Trennung der Kupplung 12 eingeleitet wird- In the case of the manual transmission 2 according to Figure 1, when the clutch pedal 11 moves out of its rest position and thus a separation of the clutch 12 is initiated
20 oder20 or
- Im Falle eines Automatgetriebes 13 nach Figur 2 solange die Steuerung 14 einen Schaltvorgang im Getriebe 13 durchführt.- In the case of an automatic transmission 13 according to FIG. 2, as long as the controller 14 carries out a switching operation in the transmission 13.
Figur 5 zeigt ein alternatives Verfahren zum Erkennen eines Schaltvorganges in Schritt 25 20. Zunächst werden in einem Schritt 23 die Signale nmot für eine Drehzahl derFIG. 5 shows an alternative method for recognizing a switching operation in step 25 20. First, in a step 23, the signals nmot for a speed of rotation
Brennkraftmaschine 1 und v für eine Fahrgeschwindigkeit erfaßt. In einem nachfolgenden Schritt 24 wird ein Verhältnis i (t) der Signale nmot und v gebildet. In einem Schritt 25 wird eine Abweichung di des aktuellen Verhältnisses i (t) mit einem zuvor bestimmten Verhältnis i (t-1) berechnet. In einem nachfolgenden Schritt 26 wird das aktuelle 30 Verhältnis i (t) als vorhergehendes Verhältnis i (t-1) gespeichert. In einem Schritt 27 wird geprüft, ob der Betrag der Abweichung di oberhalb eines Maximalwertes dmaχ liegt. Ist dies der Fall, so wird ein Schaltvorgang erkannt und zu Schritt 21 verzweigt. Anderenfalls endet das Programm nach Figur 3.Internal combustion engine 1 and v detected for a driving speed. In a subsequent step 24, a ratio i (t) of the signals n mo t and v is formed. In a step 25, a deviation di of the current ratio i (t) is calculated with a previously determined ratio i (t-1). In a subsequent step 26, the current ratio i (t) is stored as the previous ratio i (t-1). In a step 27 checked whether the amount of the deviation di is above a maximum value d ma χ. If this is the case, then a switching process is recognized and a branch is made to step 21. Otherwise the program according to FIG. 3 ends.
Der Maximalwert dmax für den Betrag der Abweichung di gibt eine zulässige Abweichung an, die noch nicht auf einen Schaltvorgang oder einen anderen die Last der Brennkraftmaschine 1 zusätzlich beeinflussenden Vorgang hinweist. Der Maximalwert dmaχ kann bei einem Schaltgetriebe 2 einen Wert von im wesentlichen Null annehmen. Bei einem Automatgetriebe 13 ist je nach Bauart zu berücksichtigen, daß auch außerhalb eines Schaltvorganges eine Veränderung des Verhältnisses i (t) hervorgerufen werden kann. Dies kann beispielsweise dann der Fall sein, wenn das Automatgetriebe 13 eingangsseitig mit einem hydraulischen Drehmomentwandler versehen ist. Durch die Wahl der Größe des Maximalwertes dmaχ kann in diesem Falle festgelegt werden, ob beispielsweise ein Schlupf in dem genannten Drehmomentwandler zu einer Unterdrückung der Änderung der Ventilsteuerung erfolgen soll oder nicht. The maximum value dmax for the amount of the deviation di indicates a permissible deviation which does not yet indicate a switching process or another process that additionally influences the load of the internal combustion engine 1. The maximum value d ma χ can assume a value of essentially zero in a manual transmission 2. In the case of an automatic transmission 13, depending on the type of construction, it must be taken into account that a change in the ratio i (t) can also be caused outside of a switching operation. This can be the case, for example, if the automatic transmission 13 is provided on the input side with a hydraulic torque converter. In this case, the choice of the size of the maximum value d ma χ can determine whether, for example, a slip should occur in the torque converter mentioned in order to suppress the change in the valve control.

Claims

Patentansprüche claims
1. Verfahren zur Steuerung einer Brennkraftmaschine, wobei die Brennkraftmaschine (1) mit einer Vorrichtung (8) zur Änderung einer Ventilsteuerung ausgestattet ist, gekennzeichnet durch folgende Schritte:1. A method for controlling an internal combustion engine, the internal combustion engine (1) being equipped with a device (8) for changing a valve control, characterized by the following steps:
- Überwachen eines der Brennkraftmaschine nachgeschalteten Getriebes (2,13), ob im Getriebe ein Schaltvorgang stattfindet,- monitoring a gearbox (2, 13) connected downstream of the internal combustion engine to determine whether a gearshift takes place in the gearbox,
- Unterdrücken einer Änderung der Ventilsteuerung, wenn ein Schaltvorgang erkannt ist.- Suppression of a change in the valve control when a switching operation is recognized.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zum Erkennen eines Schaltvorganges bei einem Schaltgetriebe (2) eine Kupplung (12) überwacht wird und bei geöffneter Kupplung auf einen Schaltvorgang geschlossen wird.2. The method according to claim 1, characterized in that a clutch (12) is monitored to detect a switching operation in a manual transmission (2) and is closed with a clutch on a switching operation.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zum Erkennen eines Schaltvorganges bei einem Automatgetriebe (13) von einem Steuergerät (14) des Automatgetriebes ein Signal (k) abgegeben wird, wenn das Steuergerät einen Schaltvorgang auslöst.3. The method according to claim 1, characterized in that to detect a switching operation in an automatic transmission (13) from a control unit (14) of the automatic transmission, a signal (k) is emitted when the control unit triggers a switching operation.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zum Erkennen eines Schaltvorganges ein Raddrehzahlsignal (v) mit einem Motordrehzahlsignal (nmot) ins Verhältnis (di) gesetzt wird und bei Änderung des Verhältnisses auf einen Schaltvorgang geschlossen wird.4. The method according to claim 1, characterized in that a wheel speed signal (v) with a motor speed signal (nmot) in the ratio (di) is set to detect a switching operation and a change in the ratio is a switching operation.
5. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß nach einem erkannten Schaltvorgang eine Änderung der Ventilsteuerung für einen sich unmittelbar anschließenden, vorgegebenen Zeitraum (tz) weiter unterdrückt wird. 5. The method according to any one of the preceding claims, characterized in that after a detected switching operation, a change in the valve control for an immediately subsequent, predetermined period (tz) is further suppressed.
PCT/DE2001/000203 2000-01-29 2001-01-18 Method for control of an internal combustion engine with variable valve control WO2001055572A2 (en)

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US09/937,699 US6634985B2 (en) 2000-01-29 2001-01-18 Method for control of an internal combustion engine with a variable valve control
JP2001555679A JP4469533B2 (en) 2000-01-29 2001-01-18 Internal combustion engine control method with variable valve control mechanism
EP01913513A EP1165952B1 (en) 2000-01-29 2001-01-18 Method for control of an internal combustion engine with variable valve control
DE50105750T DE50105750D1 (en) 2000-01-29 2001-01-18 METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE WITH VARIABLE VALVE CONTROL

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DE10003944A DE10003944A1 (en) 2000-01-29 2000-01-29 Method for controlling an internal combustion engine with variable valve control
DE10003944.8 2000-01-29

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JP2003013760A (en) * 2001-07-02 2003-01-15 Sanshin Ind Co Ltd Valve timing control device for four cycle engine for outboard motor

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US4535732A (en) * 1983-06-29 1985-08-20 Honda Giken Kogyo Kabushiki Kaisha Valve disabling device for internal combustion engines
EP0420443A1 (en) * 1989-09-28 1991-04-03 Ford Motor Company Limited Engine valve control during transmission shifts
EP0562561A1 (en) * 1992-03-26 1993-09-29 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve moving apparatus for internal combustion engine and method therefor
US5679094A (en) * 1994-12-28 1997-10-21 Nissan Motor Co., Ltd. Engine cylinder valve control system

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Publication number Priority date Publication date Assignee Title
JP2733856B2 (en) * 1989-06-01 1998-03-30 本田技研工業株式会社 Interlocking control device for internal combustion engine and transmission
JP2001214768A (en) * 2000-02-03 2001-08-10 Fuji Heavy Ind Ltd Control device for engine with variable valve timing mechanism

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Publication number Priority date Publication date Assignee Title
US4535732A (en) * 1983-06-29 1985-08-20 Honda Giken Kogyo Kabushiki Kaisha Valve disabling device for internal combustion engines
EP0420443A1 (en) * 1989-09-28 1991-04-03 Ford Motor Company Limited Engine valve control during transmission shifts
EP0562561A1 (en) * 1992-03-26 1993-09-29 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve moving apparatus for internal combustion engine and method therefor
US5679094A (en) * 1994-12-28 1997-10-21 Nissan Motor Co., Ltd. Engine cylinder valve control system

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EP1165952A1 (en) 2002-01-02
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DE10003944A1 (en) 2001-08-02
EP1165952B1 (en) 2005-03-30
DE50105750D1 (en) 2005-05-04
US6634985B2 (en) 2003-10-21
JP2003521615A (en) 2003-07-15
US20020155921A1 (en) 2002-10-24

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